var score = [59,66,64,80,78,90,55,37,60,52];
var failScore =[];
for (var i= 0;i<score.length;i++){
    if(score[i]<60){
        failScore.push(score[i]);
    }
}
console.log((failScore));
console.log('不及格的人数为：'+failScore.length);